Stopper cylinders STA/STAF
Subject to change – 2012/112 � Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAFKey features
At a glance
• Single-acting or double-acting
• Versions
– Trunnion
– Roller
– Toggle lever
• Direct mounting of solenoid valves
on flange plate
• Fast and simple set-up of conveyor
lines
• Workpiece carriers, pallets and
packages weighing up to 150 kg
can be safely stopped
• Gentle stopping without impact
vibrations or noise with toggle lever
version
• Simple actuation via valve terminal
(e.g. in combination with other
cylinders at an assembly station)
• Flanged solenoid valve permits fast
actuation even over long distances
and with individual stopper
cylinders
• Space-saving sensing via integrated
proximity sensors
Trunnion version Roller version Toggle lever version
Mounting options
Through-hole mounting Direct mounting Flange mounting
Application options and versions
For heavy masses Safety Highly effective, low noise level
Toggle lever version with integrated
shock absorber facilitates precise and
gentle stopping of the workpiece
carrier.
By means of spring return of the
piston rod in the event of pressure
failure.
2012/11 – Subject to change 3� Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAFProduct range overview
Function Version Type Piston∅ Stroke Type of mounting Cushioning Position
sensing
� Page/Internet
direct via flange
[mm] [mm] P A
Single-
or
double-
acting
Trunnion version
STA-…-P-A
STAF-…-P-A
20 15� – � �
4
32 20� � � �
50 30� � � �
Roller version
STA-…-P-A-R
STAF-…-P-A-R
20 15� – � �
10
32 20� � � �
50 30� � � �
80 30, 40– � � �
Toggle lever version
STAF-…-P-A-K 32 20
– � � �
20
Subject to change – 2012/114 � Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAF, trunnionFunctional sequence and type codes
Functional sequence
1. 2. 3.�
1. Sudden braking of the workpiece
carrier via the piston rod.
2. The workpiece carrier is released
by activating the cylinder.
The control system must hold the
piston down until the workpiece
carrier has passed the stopper
cylinder.
3. The piston rod then advances by
means of spring force or com-
pressed air. The next workpiece
carrier can then be stopped.
Type codes
STA — 20 — 15 — P — A
Type
Single-acting or double-acting
STA Stopper cylinder
STAF Stopper cylinder with flange mounting
Piston∅ [mm]
Stroke [mm]
Cushioning
P Flexible cushioning rings/pads at both ends
Position sensing
A Via proximity sensor
Version
Trunnion version
2012/11 – Subject to change 5� Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAF, trunnionPeripherals overview
1
2
Accessories
Brief description � Page/Internet
1 Proximity sensor
SME/SMT-8
Can be integrated in the cylinder profile barrel 28
2 Slot cover
ABP
For protecting against ingress of dirt 28
Subject to change – 2012/116 � Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAF, trunnionTechnical data
Function -H- Note
Contact with liquids must be
avoided during use.
-N- Diameter
20 … 50 mm
-T- Stroke length
15 … 30 mm
-W- www.festo.com
General technical data
Piston∅ 20 32 50
Pneumatic connection STA M5 Gx Gx
STAF – M5 Gx
Stroke [mm] 15 20 30
Piston rod∅ [mm] 12 20 32
Operating pressure [bar] 10
Operating medium Compressed air in accordance with ISO 8573-1:2010 [7:–:–]
Constructional design Piston cylinder with spring return
Cushioning Flexible cushioning rings/pads at both ends
Position sensing Via proximity sensor
Type of mounting Via through-holes
Via female thread
Mounting position Any
Mode of operation Single-acting or double-acting
Protection against rotation None
Ambient temperature1) [°C] 0 … +60
1) Note operating range of proximity sensors.
-H- Note: This product conforms to ISO 1179-1 and to ISO 228-1
Forces [N]
Piston∅ 20 32 50
Permissible impact force
on the advanced piston rod
260 1,000 2,900
Spring force 13 … 18 20 … 42 43 … 60
Under ”impact force” we understand
the maximum of a force-time curve
during impact/braking of the move-
able mass. It is effective vertical to the
movement axis of the piston rod. If
one regards the elastic components as
linear springs, the permitted impact
energy can be calculated from the
permitted impact force. This serves for
selecting the correct stopper.
The stopper must not switch under
this force. Depending on the mass to
be stopped, it may be advisable to
provide an elastic buffer in order to
cushion the impact, to reduce noise
and to optimize the impact energy.
�
� = Direction of impact force
2012/11 – Subject to change 7� Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAF, trunnionTechnical data
Permissible mass m as a function of the conveyor speed v
The values in the graph opposite are
based on the assumption that the
workpiece carrier is fitted with
a flexible buffer with a deformation
path of 1 mm.
STA-20-15-P-A
STA/STAF-32-20-P-A
STA/STAF-50-30-P-A
Permissible transverse force FQ during the switching operation as a function of the pressure p
Under ”permitted lateral force”
during the switching procedure, we
understand the force which still exists
vertical to the direction of movement
of the piston rod after the impact or
braking procedure, e.g. by bands still
running or the slope power take-off
force of an inclined rolling surface.
The force is effective statically. The
stopper must not switch under this
force. In order that the functioning of
the cylinder can be guaranteed,
a certain minimum pressure must be
applied.
STA-20-15-P-A
STA/STAF-32-20-P-A
STA/STAF-50-30-P-A
-H- Note
Selection aid� 16
Materials
Sectional view
Stopper cylinder
1 Piston rod Stainless steel
2 Flange Die-cast aluminium
3 Cylinder barrel Anodised aluminium
4 Springs Spring steel
5 End cap Anodised aluminium
– Seals Polyurethane
– Note on materials Free of copper, PTFE and silicone
1
2
3
5
4
Subject to change – 2012/118 � Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAF, trunnionTechnical data
Dimensions Download CAD data� www.festo.com
Direct mounting
STA-20-15-P-A
-H- Note
The socket head screw may only be
inserted via the bearing cap for design
reasons.
1 Slot for proximity sensor
SME/SMT-8
2 Socket head screw to DIN 912,
screwed through
3 Recommended minimum
screw-in depth
∅
[mm]
Stroke
[mm]
D
∅
D1
∅
D4 D5 E F F1 H H1 H2 L L1 L2 T T1
20 15 12 26 M5 M4 M5 8 45 53 64.5 15 36 22 37.5 4 18
32 20 20 38 M6 M5 Gx 8 56.5 64.5 80.5 20 50 32 52 5 20
50 30 32 53 M8 M6 Gx 8 67.5 75.5 99.5 30 68 50 71 6 20
-H- Note: This product conforms to ISO 1179-1 and to ISO 228-1
2012/11 – Subject to change 9� Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAF, trunnionTechnical data
Dimensions Download CAD data� www.festo.com
Flange mounting
1 Slot for proximity sensor
SME/SMT-8
∅
[mm]
Stroke
[mm]
B4 D
∅
D2
∅
D3
∅
D6 E1 F2 F3 F4 H2
32 20 4.5 20 11 6.6 M3 M5 8.5 14 7 20
50 30 4.5 32 15 9 M4 Gx 9 17 8 30
∅
[mm]
Stroke
[mm]
H6 H10 L L2 L5 L6 L7 L9 L10 T2 T2
32 20 16.5 67.5 50 52 83 32 65 26 16.5 4 6.2
50 30 18 85 68 71 111 45 90 36 7 5 5
-H- Note: This product conforms to ISO 1179-1 and to ISO 228-1
Ordering data
Piston∅ Stroke Direct mounting Flange mounting
[mm] [mm] Part No. Type Part No. Type
20 15 164 887 STA-20-15-P-A – –
32 20 164 888 STA-32-20-P-A 164 890 STAF-32-20-P-A
50 30 164 889 STA-50-30-P-A 164 891 STAF-50-30-P-A
Subject to change – 2012/1110 � Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAF, rollerFunctional sequence and type codes
Functional sequence
1. 2. 3.�
4.
1. Sudden braking of the workpiece
carrier via the piston rod.
2. The workpiece carrier is released
by activating the cylinder.
3. The piston rod then advances by
means of spring force or com-
pressed air until the roller makes
contact with the workpiece
carrier. The workpiece carrier
continues to move forward.
4. After the workpiece carrier has
passed, the piston rod advances
to the end position. The next
workpiece carrier can then be
stopped.
Type codes
STA — 20 — 15 — P — A R
Type
Single-acting or double-acting
STA Stopper cylinder
STAF Stopper cylinder with flange mounting
Piston∅ [mm]
Stroke [mm]
Cushioning
P Flexible cushioning rings/pads at both ends
Position sensing
A Via proximity sensor
Version
R Roller version
2012/11 – Subject to change 11� Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAF, rollerPeripherals overview
1
2
Accessories
Brief description � Page/Internet
1 Proximity sensor
SME/SMT-8
Can be integrated in the cylinder profile barrel 28
2 Slot cover
ABP
For protecting against ingress of dirt 28
Subject to change – 2012/1112 � Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAF, rollerTechnical data
Function -H- Note
Contact with liquids must be
avoided during use.
-N- Diameter
20 … 80 mm
-T- Stroke length
15 … 40 mm
-W- www.festo.com
General technical data
Piston∅ 20 32 50 80
Pneumatic connection STA M5 Gx Gx –
STAF – M5 Gx Gx
Stroke [mm] 15 20 30 30/40
Piston rod∅ [mm] 12 20 32 50
Operating pressure [bar] 10
Operating medium Compressed air in accordance with ISO 8573-1:2010 [7:–:–]
Constructional design Piston cylinder with spring return
Cushioning Flexible cushioning rings/pads at both ends
Position sensing Via proximity sensor
Type of mounting Via through-holes
Via female thread
Mounting position Any
Mode of operation Single-acting or double-acting
Protection against rotation Flat-sided piston rod
Ambient temperature1) [°C] 0 … +60
1) Note operating range of proximity sensors.
-H- Note: This product conforms to ISO 1179-1 and to ISO 228-1
Forces [N]
Piston∅ 20 32 50 80
Stroke 15 20 30 30 40
Permissible impact force
on the advanced piston rod
170 830 2,300 14,600 13,300
Spring force 13 … 18 20 … 42 43 … 60 79 … 115 101 … 170
Under ”impact force” we understand
the maximum of a force-time curve
during impact/braking of the move-
able mass. It is effective vertical to the
movement axis of the piston rod. If
one regards the elastic components as
linear springs, the permitted impact
energy can be calculated from the
permitted impact force. This serves for
selecting the correct stopper.
The stopper must not switch under
this force. Depending on the mass to
be stopped, it may be advisable to
provide an elastic buffer in order to
cushion the impact, to reduce noise
and to optimize the impact energy. � = Direction of impact force
�
2012/11 – Subject to change 13� Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAF, rollerTechnical data
Permissible mass m as a function of the conveyor speed v
The values in the graph opposite are
based on the assumption that the
workpiece carrier is fitted with
a flexible buffer with a deformation
path of 1 mm.
STA-20-15-P-A-R
STA/STAF-32-20-P-A-R
STA/STAF-50-30-P-A-R
STAF-80-...-P-A-R
Permissible transverse force FQ during the switching operation as a function of the pressure p
Under ”permitted lateral force”
during the switching procedure, we
understand the force which still exists
vertical to the direction of movement
of the piston rod after the impact or
braking procedure, e.g. by bands still
running or the slope power take-off
force of an inclined rolling surface.
The force is effective statically. The
stopper must not switch under this
force. In order that the functioning of
the cylinder can be guaranteed,
a certain minimum pressure must be
applied.
STA-20-15-P-A-R
STA/STAF-32-20-P-A-R
STA/STAF-50-30-P-A-R
STAF-80-30-P-A-R
STAF-80-40-P-A-R
-H- Note
Selection aid� 16
Materials
Sectional view
Stopper cylinder
1 Roller Steel
2 Piston rod Stainless steel
3 Flange Die-cast aluminium
4 Cylinder barrel Anodised aluminium
5 Springs Spring steel
6 End cap Anodised aluminium
– Seals Polyurethane
– Note on materials Free of copper, PTFE and silicone
2
3
4
6
5
1
Subject to change – 2012/1114 � Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAF, rollerTechnical data
Dimensions Download CAD data� www.festo.com
Direct mounting
STA-20-15-P-A-R
-H- Note
The socket head screws may only
be inserted via the bearing cap for
design reasons.
1 Slot for proximity sensor
SME/SMT-8
2 Socket head screw to DIN 912,
screwed through
3 Recommended minimum
screw-in depth
∅
[mm]
Stroke
[mm]
B D
∅
D1
∅
D4 D5 E F F1 H H1 H3
20 15 4 12 26 M5 M4 M5 8 45 53 64.5 3
32 20 8 20 38 M6 M5 Gx 8 56.5 64.5 80.5 6
50 30 10 32 53 M8 M6 Gx 8 67.5 75.5 99.5 6
∅
[mm]
Stroke
[mm]
H4 H5 H9 L L1 L2 L3 L4 R1 T T1
20 15 24 15 4 36 22 37.5 2 4.5 5 4 18
32 20 38 20 4 50 32 52 3.5 7.5 9 5 20
50 30 50.5 30 5 68 50 71 7 12 12.5 6 20
-H- Note: This product conforms to ISO 1179-1 and to ISO 228-1
2012/11 – Subject to change 15� Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAF, rollerTechnical data
Dimensions Download CAD data� www.festo.com
Flange mounting
1 Slot for proximity sensor
SME/SMT-8
∅
[mm]
Stroke
[mm]
B B4 D
∅
D2
∅
D3
∅
D6 E1 F2 F3 F4 H3 H4 H5 H6
32 20 8 4.5 20 11 6.6 M3 M5 8.5 14 7 6 38 20 16.5
50 30 10 4.5 32 15 9 M4 Gx 9 17 8 6 50.5 30 18
80 3018 4.5 50 18 11 M4 Gx 11 17 4.5 10
63 3022
40 73 40
∅
[mm]
Stroke
[mm]
H9 H10 L L2 L3 L4 L5 L6 L7 L9 L10 R1 T2 T3
32 20 4 67.5 50 52 3.5 7.5 83 32 65 26 16.5 9 4 6.2
50 30 5 85 68 71 7 12 111 45 90 36 7 12.5 5 5
80 308
119107 111 11 18 160 63 135 36 18.5 18 6 6
40 129
-H- Note: This product conforms to ISO 1179-1 and to ISO 228-1
Ordering data
Piston∅ Stroke Direct mounting Flange mounting
[mm] [mm] Part No. Type Part No. Type
20 15 164 883 STA-20-15-P-A-R – –
32 20 164 884 STA-32-20-P-A-R 164 892 STAF-32-20-P-A-R
50 30 164 885 STA-50-30-P-A-R 164 893 STAF-50-30-P-A-R
80 30 – – 164 886 STAF-80-30-P-A-R
80 40 – – 164 894 STAF-80-40-P-A-R
Subject to change – 2012/1116 � Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAFTechnical data
Selection aid
Stopping a workpiece carrier
The stopper cylinder is used to brake
an individual workpiece carrier.
Example
Given:
Friction value µ = 0.1
Delivery speed v = 10 m/min
Workpiece carrier with workpiece m = 30 kg
Operating pressure p = 6 bar
Choice: Stopper cylinder STA…-50-…-R
1. Checking the permissible mass
The maximum permissible mass at a
delivery speed of 10 m/min is 60 kg.
This means that the total mass of the
workpiece carrier and workpiece of
30 kg is permissible.
STA-20-15-P-A-R
STA/STAF-32-20-P-A-R
STA/STAF-50-30-P-A-R
STA/STAF-80-...-P-A-R
2. Checking the permissible transverse force during the switching operation
Transverse force FQ = friction force
FFriction
FFriction = µ x m x g
= 0.1 x 30 kg x 9.81 m/s2
= approx. 30 N
The maximum permissible transverse
force at an operating pressure of 6 bar
is 1,100 N.
This means that the transverse force
of 30 N is permissible.
STA-20-15-P-A-R
STA/STAF-32-20-P-A-R
STA/STAF-50-30-P-A-R
STA/STAF-80-30-P-A-R
STA/STAF-80-40-P-A-R
2012/11 – Subject to change 17� Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAFTechnical data
Selection aid
Stopping or separating several workpiece carriers
The stopper cylinder is used to
separate workpiece carriers. Further
workpiece carriers accumulate behind
carriers already at the stopper cylin-
der. It is vital that a buffer is mounted
between the workpiece carriers
(e.g. elastomer elements).
Example
Given:
Friction value µ = 0.1
Delivery speed v = 10 m/min
Workpiece carrier with workpiece m = 30 kg
Operating pressure p = 6 bar
Maximum number of workpiece carriers accumulating simultaneously nGroup = 1
Maximum number of all queued workpiece carriers nQueue = 5
Maximum number of all advancing workpiece carriers nQueue-1 = 4
Spring travel of the workpiece carrier buffer sF = 1 mm
Choice: Stopper cylinder STA…-50-…-R
1. Checking the permissible mass of the first workpiece carrier
The maximum permissible mass at a
delivery speed of 10 m/min is 60 kg.
This means that the total mass of the
workpiece carrier and workpiece of
30 kg is permissible.
STA-20-15-P-A-R
STA/STAF-32-20-P-A-R
STA/STAF-50-30-P-A-R
STA/STAF-80-...-P-A-R
2a. Calculation of the maximum permissible impact force when workpiece carriers accumulate behind a carrier at the stopper cylinder
With the STA…-50, the maximum
permissible impact force is 2,300 N.
This means that with a total force
of 1,000 N, the number of workpiece
carriers is permissible.
Impact force calculation:
FImpact =(nGroup× m)× v2
sF=
(1× 30kg)× (10m�60s)2
0.001m= ca.850N
Friction force:
FFriction = �× (nQueue × m)× g = 0.1× (5× 30kg)× 9.81m�s2 = ca.150N
Max. total force:
FTotal force = FImpact+ FFriction = 850N+ 150N = 1000N
Subject to change – 2012/1118 � Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAFTechnical data
Selection aid
2b. Checking the permissible transverse force during the switching operation
Transverse force FQ =
friction force FFriction
FFriction = 150 N
The maximum permissible transverse
force at an operating pressure of 6 bar
is 1,100 N.
This means that the transverse force
of 150 N is permissible.
STA-20-15-P-A-R
STA/STAF-32-20-P-A-R
STA/STAF-50-30-P-A-R
STA/STAF-80-30-P-A-R
STA/STAF-80-40-P-A-R
3. Separating and advancing the workpiece carriers
The maximum permissible mass with
the STA…-50-…-R at a delivery speed
of 10 m/min is 60 kg.
Since the total mass of the four
workpiece carriers advancing on the
stopper cylinder is 120 kg, the next
largest stopper cylinder must be
selected for separating.
mTotal force = nQueue−1× m = 4× 30kg = 120kg
Max. total mass:
STA-20-15-P-A-R
STA/STAF-32-20-P-A-R
STA/STAF-50-30-P-A-R
STA/STAF-80-...-P-A-R
Result
The stopper cylinder STA…-80-…-R
must be selected for separating five
workpiece carriers.
2012/11 – Subject to change 19� Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAFTechnical data
Application example
Subject to change – 2012/1120 � Internet: www.festo.com/catalogue/...
Stopper cylinders STAF, toggle leverFunctional sequence
Functional sequence
1. 2. 3.
�
x
X = 62.8 … 63.4 mm
1. Gentle stopping of heavy masses
via a hydraulic shock absorber in
the piston rod.
2. The toggle lever is locked into the
retracted end position so that the
workpiece carrier cannot be
pushed back by the shock
absorber.
3. The workpiece carrier is released
by means of compressed air, and
the toggle lever is released
simultaneously.
4. 5.
�
4. The piston is advanced by means
of spring force or compressed air.
The toggle lever tips back which
prevents the workpiece carrier
from being pushed up.
5. The toggle lever is raised by
means of spring force and stops
the next workpiece carrier.
Protection against rotation:
The guide rod always aligns the toggle
lever precisely to the approaching
workpiece carrier.
�
Integrated shock absorber: absorbs
impact energy and stops the
workpiece carrier gently, and with low
noise levels.
The impact energy can be adjusted
using the regulating screw in the
toggle lever.
Detenting roller lever: the workpiece
carrier cannot be pushed back by the
shock absorber.
Locking mechanism for disabling the
stopper function: the workpiece
carrier is able to pass the holding
point without activating the cylinder.
-H- Note
Trunnion or roller type stopper
cylinders can be mounted in any
position.
Stopper cylinders with toggle lever
must be mounted in the vertical,
upright position.
2012/11 – Subject to change 21� Internet: www.festo.com/catalogue/...
Stopper cylinders STAF, toggle leverKey features
Mounting options for solenoid valves and valve functions
An MEH, MEBH, MOEH or MOEBH
solenoid valve can be mounted on the
stopper cylinder for quick, direct
actuation of the cylinder. This type of
actuation is only possible for stopper
cylinders with flange mounting. The
valve must be mounted on the flange
plate via a valve sub-base ZVA. The
position of the piston rod when the
solenoid valve is in the normal
position depends upon the valve type
and the position of the valve on the
cylinder.
Application Piston rod in initial position Required solenoid valve Type of mounting for the solenoid
valve
with sub-base ZVA
Single-acting
Normally advanced
173 125 MEH-3/2-5,0-B
172 999 MEBH-3/2-5,0-B
Normally retracted
173 429 MOEH-3/2-5,0-B
173 002 MOEBH-3/2-5,0-B
Double-acting
Normally advanced
173 128 MEH-5/2-5,0-B
173 005 MEBH-5/2-5,0-B
Normally retracted
173 128 MEH-5/2-5,0-B
173 005 MEBH-5/2-5,0-B
-H- Note
Cylinders are always supplied single-
acting with spring. If a double-acting
stopper cylinder is required, the filter
nipple in the exhaust port must be
removed. The exhaust port is then
used as a supply port.
Solenoid valves MEH, MEBH
� Internet: solenoid valve
Subject to change – 2012/1122 � Internet: www.festo.com/catalogue/...
Stopper cylinders STAF, toggle leverType codes and peripherals overview
STAF — 32 — 20 — P — A K
Type
Single-acting or double-acting
STAF Stopper cylinder with flange mounting
Piston∅ [mm]
Stroke [mm]
Cushioning
P Flexible cushioning rings/pads at both ends
Position sensing
A Via proximity sensor
Version
K Toggle lever version
Peripherals overview
4
5
3
2
1
Accessories
Brief description � Page/Internet
1 Plug socket with cable
KMEB
– kmeb
2 3/2-way valve
MEBH
For fast and direct actuation of the stopper cylinder mebh
3 Sub-base
ZVA
For stopper cylinder with flange 26
4 Proximity sensor
SME/SMT-8
Can be integrated in the cylinder profile barrel 28
5 Slot cover
ABP
For protecting against ingress of dirt 28
2012/11 – Subject to change 23� Internet: www.festo.com/catalogue/...
Stopper cylinders STAF, toggle leverTechnical data
Function -H- Note
Contact with liquids must be
avoided during use.
-N- Diameter
32 mm
-T- Stroke length
20 mm
-W- www.festo.com
General technical data
Pneumatic connection M5
Stroke [mm] 20
Piston rod∅ [mm] 20
Operating pressure [bar] 10
Operating medium Compressed air in accordance with ISO 8573-1:2010 [7:–:–]
Constructional design Piston cylinder with spring return
Cushioning Flexible cushioning rings/pads at both ends
Position sensing Via proximity sensor
Type of mounting Via through-holes
Mounting position Vertical, upright
Mode of operation Single-acting or double-acting
Protection against rotation Guide rod
Ambient temperature1) [°C] 0 … +60
1) Note operating range of proximity sensors.
-H- Note: This product conforms to ISO 1179-1 and to ISO 228-1
Forces [N]
Permissible impact force on the rollers
of the toggle lever when the piston rod
is advanced and the toggle lever is
pushed into its end position
480
Spring force 20 … 42
Impact force is the basis for the
calculation of permissible impact
energy. Depending upon the type of
load to be stopped, it is advisable to
use a flexible buffer to cushion the
impact, reduce noise levels and to
optimise impact energy.
�
� = Direction of impact force
Subject to change – 2012/1124 � Internet: www.festo.com/catalogue/...
Stopper cylinders STAF, toggle leverTechnical data
Permissible mass m as a function of the conveyor speed v
With a friction value of µ = 0.1
v [m/min]
m[kg]
-H- Note
The required mass for reliable
pushing into the end position is
dependent on the friction pairing
between the conveyor and conveyed
goods, other friction values on
request.
Cushioning time is increased for
partial loads.
Energy values valid for ambient
temperature T = 20 °C.
Operating range
Max. workload
Recommended minimum workload1)
Required mass2)
1) For optimum operation of the damper
2) Required mass for reliable pushing of the toggle lever into the end position with this friction value
Materials
Sectional view
Stopper cylinder
1 Piston rod Stainless steel
2 Flange Die-cast aluminium
3 Cylinder barrel Anodised aluminium
4 Springs Spring steel
5 End cap Anodised aluminium
6 Roller Polyacetate
– Seals Polyurethane
– Note on materials Free of copper, PTFE and silicone
Minimum distance to the conveyor
x
X = 62.8 … 63.4 mm
1
2
3
5
4
6
2012/11 – Subject to change 25� Internet: www.festo.com/catalogue/...
Stopper cylinders STAF, toggle leverTechnical data
Dimensions Download CAD data� www.festo.com
Flange mounting
1 Slot for proximity sensor
SME/SMT-8
∅
[mm]
B1 B2 B3 B4 D
∅
D2
∅
D3
∅
D6 E1 F2 F3 F4 H6 H7 H8
32 6 18 26 4.5 20 11 6.6 M3 M5 8.5 14 7 16.5 70 9.5
∅
[mm]
H10 L L2 L5 L6 L7 L8 L9 L10 L11 R2 R3 T2 T3
32 67.5 50 52 83 32 65 12 26 16.5 13 7.5 25 4 6.2
-H- Note: This product conforms to ISO 1179-1 and to ISO 228-1
Ordering data
Piston∅ Stroke Flange mounting
[mm] [mm] Part No. Type
32 20 164 880 STAF-32-20-P-A-K
Subject to change – 2012/1126 � Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAFAccessories
Sub-base ZVA
for stopper cylinder with flange
Material:
Wrought aluminium alloy
Free of copper, PTFE and silicone
1 = Supply port
3 = Exhaust
Dimensions and ordering data
For∅
[mm]
B1 B2 B3 D1 CRC1) Weight
[g]
Part No. Type
32 56 18 20 Gx 2 50 164 896 ZVA-1
50/80 57.5 18 20 Gx 2 52 164 897 ZVA-2
1) Corrosion resistance class 2 as per Festo standard 940 070
Components subject to moderate corrosion stress. Externally visible parts with primarily decorative surface requirements which are in direct contact with a normal industrial environment or media such as coolants or
lubricating agents.
2012/11 – Subject to change 27� Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAFAccessories
Dimensions Download CAD data� www.festo.com
Mounting dimensions for solenoid valves with sub-base ZVA on stopper cylinders
1 Solenoid can be rotated
by 180°
2 Solenoid rotated 180°
(not as supplied)
3 Plug socket KME
4 Sub-base
5 Filter nipple with 3/2-way
valves, blanking plug with
5/2-way valves
For∅
[mm]
L L1 L2 L3 L4 L5 L6
32 55.5 88.5 18.5 51.5 59 35 72
50 65 79 28 42 73 36 71
80 48.5 95.5 11.5 58.5 98 39 68
For∅
[mm]
L7 L8 L9 H1 H2 H3 H4
32 35 72 42 74.5 33.5 48.5 59.5
50 34 73 52 77 31 31 57
80 31 76 71 79 29 53 56
Subject to change – 2012/1128 � Internet: www.festo.com/catalogue/...
Stopper cylinders STA/STAFAccessories
Ordering data – Proximity sensors for T-slot, magneto-resistive Technical data� Internet: smt
Type of mounting Switch
output
Electrical connection Cable length Part No. Type
[m]
N/O contact
Insertable in the slot from above, flush
with cylinder profile, short design
PNP Cable, 3-wire 2.5 574335 SMT-8M-A-PS-24V-E-2,5-OE
Plug M8x1, 3-pin 0.3 574334 SMT-8M-A-PS-24V-E-0,3-M8D
Plug M12x1, 3-pin 0.3 574337 SMT-8M-A-PS-24V-E-0,3-M12
NPN Cable, 3-wire 2.5 574338 SMT-8M-A-NS-24V-E-2,5-OE
Plug M8x1, 3-pin 0.3 574339 SMT-8M-A-NS-24V-E-0,3-M8D
N/C contact
Insertable in the slot from above, flush
with cylinder profile, short design
PNP Cable, 3-wire 7.5 574340 SMT-8M-A-PO-24V-E-7,5-OE
Ordering data – Proximity sensors for T-slot, magnetic reed Technical data� Internet: sme
Type of mounting Switch
output
Electrical connection Cable length Part No. Type
[m]
N/O contact
Insertable in the slot from above, flush
with cylinder profile
Contacting Cable, 3-wire 2.5 543 862 SME-8M-DS-24V-K-2,5-OE
5.0 543 863 SME-8M-DS-24V-K-5,0-OE
Cable, 2-wire 2.5 543 872 SME-8M-ZS-24V-K-2,5-OE
Plug M8x1, 3-pin 0.3 543 861 SME-8M-DS-24V-K-0,3-M8D
Insertable in the slot lengthwise, flush
with the cylinder profile
Contacting Cable, 3-wire 2.5 150 855 SME-8-K-LED-24
Plug M8x1, 3-pin 0.3 150 857 SME-8-S-LED-24
N/C contact
Insertable in the slot lengthwise, flush
with the cylinder profile
Contacting Cable, 3-wire 7.5 160 251 SME-8-O-K-LED-24
Ordering data – Connecting cables Technical data� Internet: nebu
Electrical connection, left Electrical connection, right Cable length Part No. Type
[m]
Straight socket, M8x1, 3-pin Cable, open end, 3-wire 2.5 541 333 NEBU-M8G3-K-2.5-LE3
5 541 334 NEBU-M8G3-K-5-LE3
Angled socket, M8x1, 3-pin Cable, open end, 3-wire 2.5 541 338 NEBU-M8W3-K-2.5-LE3
5 541 341 NEBU-M8W3-K-5-LE3
Ordering data – Slot cover for T-slot
Assembly Length Part No. Type
[m]
Insertable from
above
2x 0.5 151 680 ABP-5-S